defer technic_cnc registrations and rm dep on it

- Resolves the multi-mod dependency cycle:
      ethereal --> bakedclay --> technic_cnc --> technic --> i3 -->
      3d_armor --> ethereal
- Defers technic_cnc registrations until after mods are loaded
- Removes dep on technic_cnc

init.lua

@@ -20,7 +20,6 @@ local clay = {
 	{"dark_green", "Dark Green"}
 }
 
-local techcnc_mod = minetest.get_modpath("technic_cnc")
 local stairs_mod = minetest.get_modpath("stairs")
 local stairsplus_mod = minetest.get_modpath("moreblocks")
 		and minetest.global_exists("stairsplus")
@@ -89,13 +88,16 @@ for _, clay in pairs(clay) do
 	end
 
 	-- register bakedclay for use in technic_cnc mod
-	if techcnc_mod then
-
-		technic_cnc.register_all("bakedclay:" .. clay[1],
-		{cracky = 3, not_in_creative_inventory = 1},
-		{"baked_clay_" .. clay[1] .. ".png"},
-		clay[2] .. " Baked Clay")
-	end
+	-- defer registration until after all mods are loaded to avoid downstream
+	-- dependency cycles on ethereal.
+	core.register_on_mods_loaded(function()
+		if minetest.get_modpath("technic_cnc") then
+			technic_cnc.register_all("bakedclay:" .. clay[1],
+			{cracky = 3, not_in_creative_inventory = 1},
+			{"baked_clay_" .. clay[1] .. ".png"},
+			clay[2] .. " Baked Clay")
+		end
+	end)
 end
 
 -- Terracotta blocks

mod.conf

@@ -1,4 +1,4 @@
 name = bakedclay
 depends = default
-optional_depends = stairs, moreblocks, lucky_block, technic_cnc, flowerpot
+optional_depends = stairs, moreblocks, lucky_block, flowerpot
 description = Adds the ability to bake clay into blocks and colour them with dye.